*{
    padding: 0 ;
    margin: 0;
    box-sizing: border-box;
}
.container{
    width: 870px;
    margin: auto;
}
.container::after{
    content: "";
    display: table;
    clear: both;
}
header{
    background-color: #61bae6;
}
nav{
    padding-top: 11px;
    padding-bottom: 11px;
}
nav .nav-left, nav .nav-center, nav .nav-right{
    float: left;
    width: 33.333333%;
}
nav .nav-left{
    height: 56px;
}
nav .nav-center{
    text-align: center;
}
nav .nav-right{
    text-align: right;
}
nav .nav-right a{
    color: #fff;
    font-size: 12px;
    font-weight: bold;
    text-decoration: none;
}
nav .nav-right a img{
    display: none;
}
/*banner部分样式*/
.col{
    width: 50%;
    float: left;
}
.banner{
    color: #fff;
}
.banner p{
    font-weight: bold;
}
.banner h1{
    margin-bottom: 25px;
    font-size: 36px;
}
.banner a{
    background-color: #2996cc;
    padding: 15px 53px;
    font-weight: bold;
    text-decoration: none;
    color: #fff;
    font-size: 12px;
    display: inline-block;
    border-radius: 2px;
    transition: 0.5s;
}
.banner a:hover{
    background-color: #1882b7;
}
.banner img{
    width: 100%;
    display: block;
}
/*页面的主体部分*/
.banner{
    margin-bottom: 60px;
}
main .col{
    width: 25%;
    float: left;
    text-align: center;
    padding-left: 10px;
    padding-right: 10px;
}
main img{
    margin-bottom: 10px;
}
main h3{
    font-size: 14px;
    margin-bottom: 10px;
}
main p{
    font-size: 14px;
    color: #657082;
}
/*首页的下载部分*/
.download{
    border-top:1px solid #e0e0e0;
    text-align: center;
    margin-top: 65px;
    margin-bottom: 65px;
    padding-top: 65px;
}
.download h2{
    margin-bottom: 20px;
}
.download p{
    margin-bottom: 35px;
}
.download a{
    display: inline-block;
}
.download img{
    margin-bottom: 0;
}

/*底部样式*/
footer{
    background-color: #1b2126;
    color: #6a777d;
    padding-bottom: 60px;
    padding-top: 60px;
}
/*响应式的代码*/
@media (max-width:600px ) {
    body{
        font-family: 微软雅黑;
    }
    .container{
        width: 80%;
    }
    /*登录按钮的响应式*/
    .nav-right span{
        display: none;
    }
    nav .nav-right a img{
        display: inline-block;
        margin-right: 30px;
    }
    /*banner部分的样式*/
    .banner .col{
        width: 100%;
        text-align: center;
    }
    .banner a{
        margin-bottom: 30px;
    }
    .banner img{
        width: 80%;
    }
    .banner h1{
        font-size: 26px;
        font-weight: normal;
    }
    /*主体部分*/
    main .col{
        width: 100%;
        margin-bottom: 20px;
    }
    main .col p{
        font-size: 14px;
    }
}
